So my husband is in Madison work camp I have been sending $100 a month and packs every quarter it never seems like it's enough he says $100 a month is nothing. How much money is really needed for hygiene and snacks?

It depends on the person and the facility. There are inmates that live on a lot less and and there are inmates that can spend up to the limits on everything and use $300/month or more. What matters is what you can afford, as the prison offers enough for an inmate to subside, what you give is extra. Be careful over-extending yourself as inmates can be good at making loved ones on the outside feel guilty and have you spend more than you can.